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. A 50 kg mass is sitting on a frictionless surface. An unknown constant force pushes the mass for
2 seconds until the mass reaches a velocity of 3 m/s
a. What is the initial momentum of the mass?
b. What is the final momentum of the mass?
c. What was the force acting on the mass?
d. What was the impulse acting on the mass?
A 12N bag is hanging with a cord. How much is the least tension exerted by the cord to stay the bag at rest?
a. 1.2N c. 2.1N
b. 21.8N d. 12N
An elevator cab that weighs 27.8 kN moves upward. What is the tension in the cable if the cab’s speed is ___.
Find the mass of the elevator:
a. At rest
b. Uniform motion
a. Increasing at a rate of 1.2m/s2
b. Decreasing at the rate of 1.2m/s2
1. A rock is dropped from a height of 1.6 meters. How fast is the rock falling just before it hits the ground?
2. What is the image description of a 3 cm tall pen light when placed at distance of 30.5 cm, from a converging lens having a focal length of 10.2 cm?
Assuming the bus in question 3 does not change its cruising speed on its way down, where does the gravitational potential energy go? Why is there a risk of brake failure in this situation?
An object with mass of 15kg is pushed along a horizontal surface ,a distance of 10m to point Q eastwards by constant of 128N the coefficient of kinetic friction between the object and the surface is 0,55 draw a force diagram showing all the force acting on the 15kg
The pressure below the depth of 25 m of a homogenous fluid is 50.473 psi.
Calculate specific weight in kN/m3,density of fluid in kgm/m3 and its specific
gravity
Two spherical objects have masses of 1.5 x 105 kg and 8.5 x 102 kg. Their centers are separated by a distance of 2500 m. Find the gravitational attraction between them.
A crane used 112.95 watts of power to raise a 17.74 N object in 4.05 seconds. Through what vertical distance was the object displaced?
